Honeywell NA 228 S-C Product specification sheet

4
6
GRÄSSLIN
2
bar
8
0
h
220V~50Hz
Z 52
UW
vom Kaltwassernetz
Nachfüllautomat Typ: NA 228
10
5
SPX
1996
TÜV / DVGW 230V ~
50/60 Hz
15
bar
16
0
30 Watt
Construction
The automatic refilling unit comprises:
Powder coated pressed steel housing
Drinking water and system connection with shutoff ball
valve
Counter with reset key
Electronic time relay
Pressure gauges for inlet and system pressure
Discharge tundish
ON/OFF switch
1.5 metre plug-in connection cable
Water meter
Bush for cable connection to a building management system
Level control
Electronic level probes
Electronic level probes connection and 1 metre mass cable
connection prepared
* For temperatures above 100 ºC, the pressure at the highest point in the cold system
must be at least 1.0 bar above the operating pressure (static height plus 1.0 bar).
Subject to change 03/99
NA 228 S-C
Automatic refilling unit
for open heating systems
Product specification sheet
Application
The NA 228 S-C automatic refilling unit with DVGW-tested backflow preventer permits the fixed connection of open heating systems to the drinking water supply network.
It integrates a backflow preventer, a check valve and a water meter in one single unit. The automatic refilling unit maintains pressure between prescribed upper and lower limits in open heating systems. It prevents back flow , back syphonage or back pressure of the heating water into the potable water network. Limitation of the refilling time is provided as well as the facility for fast and automatic refilling of the system. In addition, build up of steam in the system caused by pressure loss is prevented.
Special Features
Components DVGW-approved
Electrical changeover valve for control of the backflow
preventer
Supplementary hot-water-resistant check valve for increased protection of the drinking water network
Setting facility for fast filling or refilling of the system
Time relay, for limitation of the refilling period
Standardised discharge connection
Remote volt-free connection for electronic level probes and
mass cable
Bush for cable connection to a building management system
Circuit protection for volt-free connection
Water meter, measures the refills
Electronic level probes for level monitoring
Range of Application
The following operating data applies for the downstream system: System pressure Maximum 4.0 bar Temperature Maximum 120 ºC
Technical Data
Refilling Flow rate 110 litres/h at p = 2.0 bar Fast filling Flow rate finely adjustable between
110 litres/h and 1100 litres/h at p=2.0 bar Filling duration Adjustable between 5 and 100 minutes Water level Upper and lower level indicated by
electronic level probes Probes distance approx. 200 mm Water inlet pressure Minimum 1.5 bar, maximum 4.0 bar Remote connection 220 V, 50/60 Hz to activate compressor
level indicator switch „lack of water“
Volt-free contact Supply voltage: 230V, 50/60 Hz Power consumption: 30W Connection size: R
1
/2" and Ø15
229
Automatic Refilling unit NA 228-SC
T
NETZ
EIN/AUS
zur Heizungsanlage
Fremdanschluß
- potentialfrei -
B
10
00 00 000 0
5
bar
15
0
16
Method of Operation
If the system pressure falls below the lower set value, for example through leakage losses, then the changeover valve is opened by electronic level probes control and thereby permits water supply to the backflow preventer. The inlet pressure moves the backflow preventer to the flow position and the system is refilled until the pressure rises to the upper set limit. The time period of the refill is monitored by the time relay. Once the upper limit value has been reached, the level control closes the changeover valve and the backflow preventer goes to the
H
shutoff position. The time relay then returns to the initial position. If the inlet pressure falls to the set pressure of the backflow preventer during the automatic refilling operation, then the backflow preventer (1 bar) automatically goes to the shutoff position. The shutoff position of the backflow preventer is indicated in the viewing window (green visible = shutoff position)
Option
NA 228 S-C
Connection size R
1
/2" Soldered connection size (mm) Ø15 Weight (approx kg) 16 Dimensions (mm)
H 380 B 370 T 160
Test Certificate Number 101/87/147
230
Braukmann Water Control . Honeywell AG
Subject to change 03/99
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